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+An overview of steps required to switch to a new GCC version. This is
+a complete toolchain bring up.
+
+1. Get the MinGW-W64 GCC build of this version and get configuration
+   flags (gcc -v). The idea is to build both the cross-compiler
+   and the native compiler (with linked-in ODB plugin) as close
+   to the MinGW-W64 configuration as possible.
+
+2. Build cross-binutils:
+
+   1. Move old cross/mingw to cross/mingw-X.Y.Z.
+   2. Unpack binutils, rename to binutils, create or clean binutils-cross-build.
+   3. Build and install:
+
+      cd binutils-cross-build
+      ../binutils-cross-configure
+      make -j 16
+      make install
+
+3  Install runtime headers:
+
+   1. Unpack mingw-w64 and rename to mingw-w64, create or clean
+      mingw-w64-headers-build.
+   2. Configure & install:
+
+      cd mingw-w64-headers-build
+      ../rt-headers-cross-configure
+      make install
+
+4. Build cross-GCC, phase 1:
+
+   1. Unpack GCC, rename to gcc-cross, create or clean gcc-cross-build.
+   2. Adapt older gcc-X.Y.Z-mingw-cross.patch (--dry-run) and apply.
+   3. Adapt gcc-cross-configure based on MinGW-W64 config and old config.
+   4. Build & install GCC only:
+
+      cd gcc-cross-build
+      ../gcc-cross-configure
+      make -j 16 all-gcc
+      make install-gcc
+
+5. Build runtime:
+
+   1. Create or clean mingw-w64-build.
+   2. Build & install:
+
+      export PATH=`pwd`/cross/mingw/bin:$PATH
+      cd mingw-w64-build
+      ../rt-cross-configure
+      make -j 16
+      make install
+
+6. Build pthreads:
+
+   1. Get winpthreads, create or clean winpthreads-build
+
+      svn checkout http://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/experimental/winpthreads
+
+   2. Build and install:
+
+      export PATH=`pwd`/cross/mingw/bin:$PATH
+      cd winpthreads-build
+      ../pthreads-cross-configure
+      make -j 16
+      make install
+
+7. Build cross-GCC, phase 2:
+
+   1. Build & install:
+
+      cd gcc-cross-build
+      make -j 16
+      make install
+
+   2. Disable .dll & .la files in i686-w64-mingw32/lib.
+
+   3. Check that the compiler works. Compile and run sizeof_funds.cxx and
+      throw.cxx.
+
+8. Package runtime:
+
+   1. Save mingw-rt as mingw-rt-X.Y.Z
+
+   2. Package:
+
+      cd mingw-w64-headers-build
+      make DESTDIR=/home/boris/work/odb/build/mingw-w64/mingw-rt install
+
+      cd mingw-w64-build
+      make DESTDIR=/home/boris/work/odb/build/mingw-w64/mingw-rt install
+
+      cd winpthreads-build
+      make DESTDIR=/home/boris/work/odb/build/mingw-w64/mingw-rt install
+
+      Move to the top level directory.
+
+9. Build binutils:
+
+   1. Create or clean binutils-build, /mingw.
+   2. Build and install:
+
+      export PATH=`pwd`/cross/mingw/bin:$PATH
+      cd binutils-build
+      ../configure-binutils
+      make -j 16
+      make install
+
+   3. Copy /mingw/* to mingw-binutils.
+
+10. Build GCC prerequisites (gmp, mpfr, mpc):
+
+    1. Unpack {gmp, mpfr, mpc}
+    2. Build and install:
+
+      cd {gmp, mpfr, mpc}
+      ../gcc-prereq-configure
+      make -j 16
+      make install
+
+11. Build the native compiler:
+
+  1. Unpack GCC, rename to gcc, create or clean gcc-build.
+  2. Adapt older gcc-X.Y.Z-mingw.patch (--dry-run) and apply.
+  3. Adapt older gcc-X.Y.Z-static-plugin.patch (--dry-run) and apply.
+     This step will probably require careful review of changes in the
+     plugin code (plugin.h and plugin.c).
+  4. Regenerate configure script in gcc/gcc/. Use the same autoconf
+     version as in the original (see ~/build/autocond-X.Y). For example:
+
+     sudo make -C ~/build/autoconf-2.64 install
+     autoconf --version
+     cd gcc
+     autoconf
+     sudo make -C ~/build/autoconf-2.64 uninstall
+
+  4. Adapt gcc-configure.
+  5. Configure and make GCC manually:
+
+     export PATH=`pwd`/cross/mingw/bin:$PATH
+     cd gcc-build
+     ../gcc-configure
+     make -j 16
+
+     This step will fail due to lack of libplugin-stub.a. That's
+     ok. Copy .h and .def files from gcc-build/gcc/ to gcc-headers/
+     (backup old ones).
+
+4. Run the build-dist script with -rebuild
+
+   1. If GCC build fails, then it can be re-configured or re-made
+      directly from the gcc-build directory provided you don't
+      clean it up (if you do so, you can manually copy libplugin-stub.a
+      to gcc-build/gcc/).
+
+   2. Check the package for any stray directories/files. Compare size to
+      the old version.
+
+   3. On Windows, check that:
+
+      - Compiler, including exceptions, work. Compile and run sizeof_funds.cxx
+        and throw.cxx.
+
+      - Make sure ODB runs, including throwing exceptions (run on object
+        with private data members).
+
+5. Copy updates/patches to odb/etc/.